//package com.fmh.filter;
//
//import com.fmh.jwt.JWTToken;
//import lombok.extern.slf4j.Slf4j;
//import org.apache.shiro.web.filter.authc.BasicHttpAuthenticationFilter;
//import org.springframework.http.HttpStatus;
//import org.springframework.web.bind.annotation.RequestMethod;
//
//import javax.servlet.ServletRequest;
//import javax.servlet.ServletResponse;
//import javax.servlet.http.HttpServletRequest;
//import javax.servlet.http.HttpServletResponse;
//import java.io.IOException;
//
///**
// * @author 房梦豪
// * @version 1.0
// * @description: TODO
// * @date 2021/9/28 16:30
// */
//@Slf4j
//public class JWTFilter extends BasicHttpAuthenticationFilter {
//
//    /**
//     * 判断用户是否想要登陆
//     * 检测header中是否包含Authorization字段即可
//     */
//    @Override
//    protected boolean isLoginAttempt(ServletRequest request, ServletResponse response) {
//        HttpServletRequest req = (HttpServletRequest) request;
//        String authorization = req.getHeader("Authorization");
//        return authorization != null;
//    }
//
//    @Override
//    protected boolean executeLogin(ServletRequest request, ServletResponse response) throws Exception {
//        HttpServletRequest req = (HttpServletRequest)request;
//        String authorization = req.getHeader("authorization");
//
//        JWTToken token = new JWTToken(authorization);
////        提交给realm处理
//        getSubject(request, response).login(token);
////        没有抛出异常代表登陆成功
//        return true;
//    }
//
//    @Override
//    protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue) {
//        if (isLoginAttempt(request, response)) {
//            try {
//                executeLogin(request, response);
//            } catch (Exception e) {
//                response401(request,response);
//            }
//        }
//        return true;
//    }
//
//    @Override
//    protected boolean preHandle(ServletRequest request, ServletResponse response) throws Exception {
//        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
//        HttpServletResponse httpServletResponse = (HttpServletResponse) response;
//        httpServletResponse.setHeader("Access-control-Allow-Origin", httpServletRequest.getHeader("Origin"));
//        httpServletResponse.setHeader("Access-Control-Allow-Methods", "GET,POST,OPTIONS,PUT,DELETE");
//        httpServletResponse.setHeader("Access-Control-Allow-Headers", httpServletRequest.getHeader("Access-Control-Request-Headers"));
//        // 跨域时会首先发送一个option请求，这里我们给option请求直接返回正常状态
//        if (httpServletRequest.getMethod().equals(RequestMethod.OPTIONS.name())) {
//            httpServletResponse.setStatus(HttpStatus.OK.value());
//            return false;
//        }
//        return super.preHandle(request, response);
//    }
//
//    private void response401(ServletRequest request, ServletResponse response) {
//        try {
//            HttpServletResponse httpServletResponse = (HttpServletResponse) response;
//            httpServletResponse.sendRedirect("/401");
//        } catch (IOException e) {
//            log.error(e.getMessage());
//        }
//    }
//}
